Add new tools, wiki-links, system prompt file, model badge

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+# Changelog — 2026-03-24 (15)
+
+## New Tools
+
+- **grep_search**: Case-insensitive text search across markdown file contents with optional file path filter. Returns `path:line: text` format, capped at 50 results.
+- **create_file**: Create new files with content. Auto-creates parent folders. Requires approval. Shows content preview in approval dialog.
+- **move_file**: Move/rename files using `fileManager.renameFile()` which auto-updates all `[[wiki-links]]`. Auto-creates target folders. Requires approval.
+
+## Wiki-Link Support in AI Responses
+
+- System prompt now instructs the AI to use `[[Note Name]]` wiki-link syntax when referencing vault notes.
+- Added click handlers on rendered `a.internal-link` elements in chat bubbles so links navigate to the target note via `workspace.openLinkText()`.
+
+## Custom System Prompt from Vault File
+
+- New settings: "Use Custom Instructions" toggle and "Prompt File" path input (default `agent.md`).
+- When enabled, reads the vault note content at send time and injects it as a system prompt alongside the built-in tool instructions.
+- Works even when no tools are enabled.
+- File path input appears greyed out and disabled when the toggle is off.
+
+## Model Badge
+
+- Added a pill-shaped model indicator in the top left of the chat area.
+- Shows the currently selected model name, or "No model selected" in muted italic when none is configured.
+- Updates automatically when the settings modal closes.
+
+## System Prompt Updates
+
+- Added LINKING TO NOTES, CREATING FILES, MOVING/RENAMING FILES, and SEARCHING FILE CONTENTS sections to the tool system prompt.
+- Updated approval tool list to include `create_file` and `move_file`.
+
+## Research Notes
+
+- Created `.notes/research/plugin-feature-ideas.md` with 12 potential feature ideas organized by impact level.
+
+## Files Changed
+
+- `src/tools.ts` — three new tool execute functions and TOOL_REGISTRY entries
+- `src/ollama-client.ts` — system prompt updates, `userSystemPrompt` plumbing through agent loop and both chat functions
+- `src/chat-view.ts` — wiki-link click handlers, system prompt file reading, model badge, create_file approval preview
+- `src/settings.ts` — `useSystemPromptFile` and `systemPromptFile` settings
+- `src/settings-modal.ts` — toggle + file path input for custom instructions
+- `styles.css` — disabled setting style, model badge styles